Hey, we're sitting here on the bus right now, wondering how many axles of a three-axle articulated bus are powered 😀 And yes, the question is rather unimportant, but interesting nonetheless. Thanks 😉
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In the normal case only one axis, namely in most factories that push the bus in front of it – i.e. the trailer.
This is because most buses have the engine in the rear and then, of course, the power transmission to the next axle is the technically simplest solution.
However, there are also some models (e.g. the vehicles of the Belgian manufacturer van Hool) with a standing middle motor in the front car, in which the “medium” axle is then driven.
This has the advantage that the rear axle can then be constructed so as to be steerable, whereby the vehicles become “more maneuverable”. And so van Hool can easily build the 25 m long double-joint buses – these would probably be difficult to keep track stable when driving the last axle.
One disadvantage is, among other things, that a middle engine is more accessible due to its position and is therefore more difficult to maintain and repair. Therefore, sic has prevailed with most manufacturers of the rear motor
Nowadays, almost only “Schublenkbusses” are built, i.e. the rear axle (i.e. behind the joint) is driven. It used to be different. There were both centrally driven buses (where the rear was reared), and partly synchronized controls where the middle and rear were driven. But that was abandoned at some point because it was more expensive to build and there was no use for it.
Thanks 😀 👍🏼👌🏼
van Hool still builds buses with central motor (solo, joint and double joint).
And this has a lot of use in articulated buses: the co-directional rear axle, thanks to which you get much better around the curves.
an axis, namely the rearmost